EP0765076B1 - Circuit de balayage horizontal de télévision muni d'une capacité de S commutée par un thyristor - Google Patents

Circuit de balayage horizontal de télévision muni d'une capacité de S commutée par un thyristor Download PDF

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Publication number
EP0765076B1
EP0765076B1 EP96202557A EP96202557A EP0765076B1 EP 0765076 B1 EP0765076 B1 EP 0765076B1 EP 96202557 A EP96202557 A EP 96202557A EP 96202557 A EP96202557 A EP 96202557A EP 0765076 B1 EP0765076 B1 EP 0765076B1
Authority
EP
European Patent Office
Prior art keywords
thyristor
diode
cathode
capacitance
ground
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96202557A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0765076A2 (fr
EP0765076A3 (enrdf_load_stackoverflow
Inventor
Régis Vingtrois
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP0765076A2 publication Critical patent/EP0765076A2/fr
Publication of EP0765076A3 publication Critical patent/EP0765076A3/xx
Application granted granted Critical
Publication of EP0765076B1 publication Critical patent/EP0765076B1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/27—Circuits special to multi-standard receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
    • H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements

Definitions

  • the present invention relates to a scanning circuit horizontal, called diode modulator, for a device image display, comprising a switch element main semiconductor with an active terminal and a terminal connected to ground, in parallel with two diodes connected in cascade in opposite direction to direction direct from the main switch element, provided with a first branch connected between the active terminal of the main switch and ground, made of cascade mounting of a deflection winding, of a first capacity called S and a self-inductance, and provided with a second branch, made of cascading of a capacity additional S and a thyristor to activate or not this additional S capacity.
  • the invention applies, inter alia, for the implementation service or not with an additional capacity of S, in the purpose of correcting the lateral parts of an image of 4/3 format television, shown on a format screen 16 / 9th, by means of a simultaneous action on the amplitude of scanning using the diode modulator.
  • a horizontal scanning circuit according to the preamble above is known from document DE-A-2 655 946.
  • An object of the invention is to solve the same problem than that set out in the prior art, by eliminating the expensive transformer.
  • the invention is therefore based, among other things, on the idea to isolate the cathode of the thyristor, by means of a diode series, compared to the high voltages that are present at the midpoint, which triggers the thyristor in applying a trigger linked to the return of the line scanning using a simple resistance divider.
  • the circuit comprises, to control the thyristor, a control transistor whose path main current connects the thyristor trigger to the mass.
  • the circuit comprises a so-called diode parallel, in parallel with the assembly made of the thyristor and of the serial diode, parallel diode whose passing direction is opposite to that of this set.
  • the parallel diode is advantageously shunted by a resistance.
  • the invention also relates to a display device images equipped with a device according to the invention.
  • the single figure shows an example of a diagram of a circuit according to the invention.
  • the horizontal scanning circuit known as a modulator diodes, represented by figure 1 includes an element main switch, here an NPN type TR transistor, controlled in a known manner at line frequency by a signal applied to a DR input, with an active terminal made up by its collector, and a terminal connected to ground, to know its transmitter. Its collector is connected to a source S positive supply voltage by winding primary LT of a known transformer called “transformer lines ", whose other windings are not represented.
  • transformer lines whose other windings are not represented.
  • diodes D1 and D2 connected in cascade in direction inverse with respect to the direct direction of the transistor TR, that is to say that the cathode of D1 is connected to the collector of TR and the anode of D2 is connected to ground. Their common point is referenced PMED.
  • a capacity C1 and a capacity C2, called “back”, are connected in parallel with D1 and D2 respectively.
  • a first branch BR1 connected between the collector of the transistor TR and the ground, has in cascade a deflection winding LD, a first capacity CS1 called S connected, in point 2, to a self-inductance constituted by a winding of a TR transformer.
  • the deflection coil LD is placed between the collector of transistor TR and the capacity CS1.
  • Another winding, called secondary of the transformer TR is here connected to point 2, in series with the primary. Its end where the most stress occurs high is connected by a C3 capacity to the PMED point.
  • the secondary winding could be connected to the mass instead of being in series with the primary (the number of turns would be different).
  • Capacity C3 can be placed on either side of the secondary winding.
  • a simple self-inductance is sometimes used instead of the transformer, and the C3 capacity is then connected to point 2. All of these variants are compatible with the invention.
  • An E / W input allows application to the PMED point, via a shutdown inductor, with an adjustment voltage of line amplitude and a modulated voltage in the form of parable, called "east / west correction", which can modulate the amplitude of the current in LD without modifying the height of pulses in LT, i.e. without changing the voltages generated by the line transformer.
  • a second branch BR2 comprises, in cascade, a additional S capacity CS2, a thyristor TH, having for function of putting into service or not this capacity of S additional CS2, and a diode D4, called a serial diode.
  • the CS2 capacity is connected on one side to common point 1 between the deflection coil LD and the capacity CS1, and on the other side at the anode of the TH thyristor.
  • Diode D4 has its anode connected to the thyristor TH cathode, and its cathode connected to the PMED point.
  • a first resistor R1 is connected between the point median PMED and the thyristor trigger, a second resistance R2 is connected between the trigger and the cathode thyristor, and a third resistor R3 is connected between the thyristor cathode and ground.
  • Resistor R1 is made up of two parts with a intermediate point.
  • the route main current of a control transistor TC is connected between the intermediate point of resistance R1 and the mass. This transistor is made conductive or is cut, by means of a signal applied to a CT input. In variant, it could also be connected directly to the thyristor trigger.
  • a diode D3, called parallel diode, is connected in parallel with the assembly made of the thyristor TH and the D4 series diode, parallel diode with passing direction inverse of that of this set, that is to say that its cathode is connected to the anode of the thyristor, and its anode is connected to the cathode of D4.
  • Parallel diode D3 is shunted by a resistor R4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
EP96202557A 1995-09-20 1996-09-12 Circuit de balayage horizontal de télévision muni d'une capacité de S commutée par un thyristor Expired - Lifetime EP0765076B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9511035A FR2738976A1 (fr) 1995-09-20 1995-09-20 Circuit de balayage horizontal de television muni d'une capacite de s commutee par un thyristor
FR9511035 1995-09-20

Publications (3)

Publication Number Publication Date
EP0765076A2 EP0765076A2 (fr) 1997-03-26
EP0765076A3 EP0765076A3 (enrdf_load_stackoverflow) 1997-05-02
EP0765076B1 true EP0765076B1 (fr) 2002-10-30

Family

ID=9482750

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96202557A Expired - Lifetime EP0765076B1 (fr) 1995-09-20 1996-09-12 Circuit de balayage horizontal de télévision muni d'une capacité de S commutée par un thyristor

Country Status (8)

Country Link
US (1) US5666033A (enrdf_load_stackoverflow)
EP (1) EP0765076B1 (enrdf_load_stackoverflow)
JP (1) JP3732901B2 (enrdf_load_stackoverflow)
KR (1) KR100384913B1 (enrdf_load_stackoverflow)
DE (1) DE69624542T2 (enrdf_load_stackoverflow)
FR (1) FR2738976A1 (enrdf_load_stackoverflow)
MY (1) MY113520A (enrdf_load_stackoverflow)
SG (1) SG73989A1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69711783D1 (de) * 1996-08-07 2002-05-16 Victor Company Of Japan Horizontale S-Form-Korrektionsschaltung
DE69731456T2 (de) * 1996-08-26 2005-10-13 Koninklijke Philips Electronics N.V. Diodenmodulator zur erzeugung einer zeilen-s-korrektur
JPH10164388A (ja) * 1996-11-25 1998-06-19 Lg Electron Inc 水平ｓ字補正回路
US6066830A (en) * 1998-06-04 2000-05-23 Astronics Corporation Laser etching of electroluminescent lamp electrode structures, and electroluminescent lamps produced thereby
US6215175B1 (en) 1998-07-06 2001-04-10 Micron Technology, Inc. Semiconductor package having metal foil die mounting plate

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1574726A (en) * 1976-03-19 1980-09-10 Rca Corp Side pincushion distortion correction circuit
DE2655946A1 (de) * 1976-12-10 1978-06-15 Licentia Gmbh Umschaltbare zeilenablenkschaltung fuer einen mehrnormenfernsehempfaenger
GB2177270A (en) * 1985-06-19 1987-01-14 Philips Electronic Associated Line output circuit for generating a sawtooth current at two frequencies
JPH0748805B2 (ja) * 1990-05-28 1995-05-24 三菱電機株式会社 オート・トラッキング・モニタのｓ字補正コンデンサ切替装置
JPH07326302A (ja) * 1994-05-30 1995-12-12 Mitsubishi Electric Corp ディスプレイモニタ装置のｓ字補正コンデンサ切替装置

Also Published As

Publication number Publication date
US5666033A (en) 1997-09-09
EP0765076A2 (fr) 1997-03-26
DE69624542T2 (de) 2003-06-26
JP3732901B2 (ja) 2006-01-11
EP0765076A3 (enrdf_load_stackoverflow) 1997-05-02
JPH09130631A (ja) 1997-05-16
SG73989A1 (en) 2000-07-18
FR2738976A1 (fr) 1997-03-21
KR100384913B1 (ko) 2003-08-21
KR970019340A (ko) 1997-04-30
MY113520A (en) 2002-03-30
DE69624542D1 (de) 2002-12-05

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